benchmarks: Avoid brackets and commas in test names.

bench/BlurRoundRectBench.cpp

Index: bench/BlurRoundRectBench.cpp
diff --git a/bench/BlurRoundRectBench.cpp b/bench/BlurRoundRectBench.cpp
index ef88422e3cffa617f994f45e38bb994a62acd25c..713996c0ca1163a796d21e856227ff9ee2e4a86b 100644
--- a/bench/BlurRoundRectBench.cpp
+++ b/bench/BlurRoundRectBench.cpp
@@ -25,7 +25,7 @@ class BlurRoundRectBench : public Benchmark {
 public:
     BlurRoundRectBench(int width, int height, int cornerRadius)
         : fName("blurroundrect") {
-        fName.appendf("_WH[%ix%i]_cr[%i]", width, height, cornerRadius);
+        fName.appendf("_WH_%ix%i_cr_%i", width, height, cornerRadius);
         SkRect r = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
         fRRect.setRectXY(r, SkIntToScalar(cornerRadius), SkIntToScalar(cornerRadius));
     }